PENTAX FA 100mm F2.8 Macro

Equiv. focal length 150 mm (full format equivalent)
Equiv. aperture f/4.2 (full format equivalent, in terms of depth-of-field)
Optical construction 9 elements in 8 groups
Number of aperture blades 8
min. focus distance 0.31 m (max. magnification ratio 1:1, minimum working distance: ~10.5cm)
Dimensions 75 x 104 mm
Weight 600 g
Filter size 58 mm (non-rotating)
Hood – 
Other features FREE (Fixed Rear Element Extension) focusing system